Conception and Pregnancy 0.0 / 5 ? BiologyAnimal physiologyInternational BaccalaureateOther Created by: Lotto65Created on: 16-10-17 08:32 When do women who are not pregnant follow the menstrual cycle? Between puberty and the menopause 1 of 44 Which two hormones control the menstrual cycle? FSH and LH 2 of 44 Which gland produces FSH and LH? Pituitary gland 3 of 44 Which tissue produces estrogen and progesterone? Ovaries 4 of 44 What type of feedback control is used for the menstrual cycle? Positive and negative 5 of 44 What is another name for an egg? Oocyte 6 of 44 What is a follicle? A fluid filled sac that the oocyte matures in 7 of 44 What happens in ovulation? The follicle where the oocyte matures bursts to release the egg 8 of 44 What happens in feedback systems? The level of produc feeds back to control the rate of its own production 9 of 44 What is the effect of a negative feedback system and why? Stabilising effect because a change in levels always causes the opposite effect 10 of 44 In a negative feedback system, a rise in levels causes... A decrease in production to reduce levels 11 of 44 In a negative feedback system, a decrease in levels feeds back to... Increase production and raise the level 12 of 44 What does positive feedback lead to? Sudden rises and falls 13 of 44 At the start of menstruation, FSH levels lesk to cause... Follicles to develop 14 of 44 What else does FSH do apart from stimulate follicle development? Stimulates secretion of estrogen 15 of 44 Where is oestrogen secreted by FSH? Follicle wall 16 of 44 What does oestrogen do to FSH? Stimulates an increase in production of FSH receptors in follicles which boosts FSH sensitivity to bkost estrogen production 17 of 44 The FSH and estrogen cycle is what type of feedback system? Positive 18 of 44 What does estrogen do in the uterus? Stimulates repair and thickening of uterus lining aftef menstruation 19 of 44 What is another word for uterus lining? Endometrium 20 of 44 High levels of estrogen stimulate what? LH secretion 21 of 44 What does LH inhibit? FSH secretion 22 of 44 The inhibition of FSH leads to... A fall in estrogen secretion 23 of 44 What type of feedback system is LH and FSH? Negative 24 of 44 What happens when LH reaches a sudden high peak? Stimulates completion of meiosis in eggs and partial digestion of follicle wall to allow ovulation 25 of 44 What else does LH do to the follicle? Develops the wall of the follicle into corpus luteum 26 of 44 Which hormones does the corpus luteum secrete? Estrogen and progesterone 27 of 44 What does progesterone promote? Thickening and maintenance of the endometrium 28 of 44 High levels of progesterone and estrogen inhibit... LH and FSH 29 of 44 Why is this negative feedback? FSH and LH stimulate estrogen and progesterone which inhibits FSH and LH 30 of 44 If embryo forms, the levels of what decrease? Progesterone and estrogen 31 of 44 When will FSH start to be secreted? When estrogen and progesterone levels are low enough 32 of 44 When FSH levels start to rise, what does that mark? The start of the next menstrual cycle 33 of 44 What are the four functions of testosterone? Pre-natal development of genitalia; secondary sexual characteristics development; stimulates final stages of spermatogenesis; maintains sex drive 34 of 44 What are the functions of FSH? Causes one or more follicles in the ovaries to mature; stimulates secretion of oestrogen 35 of 44 What are the functions of LH? Stimulates ovulation; stimulates conversion of empty follicle into corpus luteum; stimulates progesterone and oestrogen secretion 36 of 44 What are the functions of oestrogen? Initiates repair of uterus lining; positive feedback on LH to trigger ovulation 37 of 44 What are the functions of progesterone? Completes repair of uterus lining; negative feedback on pituitary to block release of FSH; maintains uterus lining in early part of pregnancy 38 of 44 Which part of the pituitary gland is FSH and LH released from? Anterior 39 of 44 Where is oestrogen released from? Follicle cells 40 of 44 Oestrogen has negative feedback on... FSH 41 of 44 Oestrogen has positive feedback on... LH 42 of 44 What is progesterone released by? Corpus luteum 43 of 44 Progesterone has negative feedback on... FSH and LH 44 of 44
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